<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- 相对与div将区域语义化可以更好描述网页的结构 -->
    <div class="container">
        <header>头部</header>
        <nav>导航</nav>
        <div>
            <section>定义一个区域</section>
            <aside>定义一个右侧内容</aside>
        </div>
        <footer>底部</footer>
    </div>

</body>
</html>